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Biochemical and Biophysical Research Communications:复旦大学研究提示治疗过敏或有新途径

2019-08-19 孙国根 黄辛 科学网

复旦大学医学院陈力教授课题组利用独创的细菌糖苷酶功能基因组分析平台,首次发现在同一个细菌中的两种酶,它们可分别清除导致人体“过敏”的两种主要致敏原。该研究成果具有重要临床应用价值,近日已发表于国际学术期刊《生物化学与生物物理研究通讯》。据悉,相关酶制剂的制备及应用方法已申请国家专利保护。


复旦大学医学院陈力教授课题组利用独创的细菌糖苷酶功能基因组分析平台,首次发现在同一个细菌中的两种酶,它们可分别清除导致人体“过敏”的两种主要致敏原。该研究成果具有重要临床应用价值,近日已发表于国际学术期刊《生物化学与生物物理研究通讯》。据悉,相关酶制剂的制备及应用方法已申请国家专利保护。

据悉,全球人口中有22%过敏。过敏主要是人体的免疫系统对进入机体的异源异种糖蛋白发生过度的免疫反应而导致的疾病,可影响皮肤、呼吸道、心血管消化道及神经系统的正常功能,严重时会致命。常见的过敏原主要来自于花粉、螨虫和霉菌。由于个体体质的不同,花生、坚果、鱼类及牛奶等均可导致过敏。

陈力介绍,导致人体过敏的糖蛋白上有两大类致敏原,一是蛋白多肽,一是糖蛋白寡糖。糖蛋白寡糖过敏原又可分为核心岩藻糖和核心木糖两种,因这两种过敏原在不同物种中广泛分布,又被称为“共有寡糖过敏原”(CCD)。正是CCD的存在,导致人类接触不同花粉、昆虫等均会发生快速过敏。如何清除CCD缓解过敏,是世界面临的一大难题。

为解决这一难题,陈力课题组自2011年起进行糖苷酶相关研究,终于在2018年找到了可以清除核心岩藻糖CCD引起过敏的核心岩藻糖糖苷酶,它的发现,打开了脱敏的一个窗口。为打开脱敏的另一个窗口,研究人员又开展了核心木糖糖苷酶的研究。今年7月,他们又找到了首个能够清除木糖型CCD引起过敏的核心木糖糖苷酶。据介绍,用这两种酶,分别处理具有核心岩藻糖型及核心木糖型的过敏原后,所有过敏病人的血清,对处理后过敏原反应均有4%至50%下降。此证实清除CCD过敏原是治疗过敏的一种新途径。

“我们在同一个细菌中发现了这两种酶,而且这两种酶的基因在细菌基因组上头尾串联。”陈力表示,这种串联在一起的基因在生物学上被称为操纵子。研究人员找到的这世界第一个脱敏操纵子,就像双截棍,可以有效解除糖蛋白上两种最主要的过敏原。

“这项研究提示利用微生物的能力,改善人体健康是可行的。”陈力表示,目前的工作只是解答了糖蛋白寡糖型过敏问题,但解码蛋白多肽过敏还有很长的路要走。

原始出处:

Linlin Hou,et al.Identification and characterization of a novel glycoprotein core xylosidase from the bacterium Elizabethkingia meningoseptica.Biochemical and Biophysical Research Communications.Volume 517, Issue 2, 17 September 2019, Pages 390-397

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    2020-06-10 stfoxst
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    2020-07-29 sunylz
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    2019-08-29 hb2008ye
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    2020-07-24 liuli5079
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    2019-08-21 saikp
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    2019-08-21 yangshch

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